Fix semantic classification regressions (#19905)#19960

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T-Gro:fix/issue-19905

Commits on Jun 16, 2026

Fix #19905 (item 1): suppress synthesized delegate Invoke value classification

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Test #19905 (item 1): tupled-arg delegate decl has no Method classification

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Test #19905 (item 6): pin MailboxProcessor<int>.Start (skipped pending #19905 items 3+4 fix)

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Fix #19905 (items 3+4): generic type-arg <> mis-classified as Function/Type in method/ctor calls

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Fix #19905 (item 2): CE builder inside list/array comprehension classified as ComputationExpression

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Fix #19905 (item 5): open-ended slice `xs[0..]` closing bracket no longer classified as Function

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Fix #19905 (item 7): `open type T` reported as unused for DU union cases

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Add PR #19960 links to release notes for #19905 fixes

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